Successfully complete DC Story mode. Then, press R1 at the character selection screen. Note: Darkseid does not have any Heroic Brutalities.

Play as Shao Kahn

Successfully complete Mortal Kombat Story mode. Then, press R1 at the character selection screen. Note: Shao Kahn does not have any Fatalities.

Alternate costumes

At character selection screen, press Start when choosing a character.

Ultimate Icy Counter

While playing as Sub-Zero, press Square(2), Down, Back, Square or Square(2) to perform Icy Counter. The game registers the opponent's knockback as an attack and can then be countered using Sub-Zero's Icy Counter. If done at the correct angle, you can miss your opponent when countering and set yourself up for another move while your opponent is still frozen.

Moves

The following is a list of the special moves, pro moves, and finishing moves for all characters:

The following video is of all Fatalities and Heroic Brutalities being performed:

Easy "Combo Champion" trophy

Play as Sonya Blade, and perform her Bicycle Kick on an opponent to get ten hits each time and get the "Combo Champion" trophy. Alternately, play as The Flash. When the fight begins, press Away, Forward, Triangle. He should charge at your opponent and do a series of punches which gives you a 11-hit combo.

Easy "MK Arcade Champion" and "DC Arcade Champion" trophy

To normally get these trophies, you must complete the game with all characters in Arcade mode from each side. If you do not want to play as all the characters, you can simply play as your favorite character, and once you reach Dark Kahn, press Start, and choose "Player Select". Choose a fighter you have not completed Arcade mode with yet, and defeat Dark Kahn with him or her. Also, it is much easier to play on the Very Easy difficulty so you can defeat Dark Kahn easily with the characters you are not familiar with.